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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>equal_to, not_equal_to, less, greater, less_equal, greater_equal<small>(std::experimental::propagate_const)</small></h1>
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<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">struct</span> equal_to<span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div></td>
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<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">struct</span> not_equal_to<span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div></td>
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</tr>
<tr class="t-dcl t-since-libfund_ts_2">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">struct</span> less<span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span> </td>
</tr>
<tr class="t-dcl t-since-libfund_ts_2">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">struct</span> greater<span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span> </td>
</tr>
<tr class="t-dcl t-since-libfund_ts_2">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">struct</span> less_equal<span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span> </td>
</tr>
<tr class="t-dcl t-since-libfund_ts_2">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">struct</span> greater_equal<span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span></span></span> 部分特化标准比较函数对象。
</p><p>令 <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">t_</span></span></span> 代表 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> p</span></span> 所包装的仿指针对象，则给定 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span></span></span> 类型的指针 <code>p</code> 和 <code>q</code> ，下列应当成立：
</p>
<ul><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/functional/equal_to.html"><span class="kw1035">std::<span class="me2">equal_to</span></span></a><span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="../../utility/functional/equal_to.html"><span class="kw1035">std::<span class="me2">equal_to</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span>
</li><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/functional/not_equal_to.html"><span class="kw1036">std::<span class="me2">not_equal_to</span></span></a><span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="../../utility/functional/not_equal_to.html"><span class="kw1036">std::<span class="me2">not_equal_to</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span>
</li><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/functional/less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="../../utility/functional/less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span>
</li><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/functional/greater.html"><span class="kw1037">std::<span class="me2">greater</span></span></a><span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="../../utility/functional/greater.html"><span class="kw1037">std::<span class="me2">greater</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span>
</li><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/functional/less_equal.html"><span class="kw1040">std::<span class="me2">less_equal</span></span></a><span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="../../utility/functional/less_equal.html"><span class="kw1040">std::<span class="me2">less_equal</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span>
</li><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/functional/greater_equal.html"><span class="kw1038">std::<span class="me2">greater_equal</span></span></a><span class="sy1">&lt;</span><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="../../utility/functional/greater_equal.html"><span class="kw1038">std::<span class="me2">greater_equal</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span>
</li></ul>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>这些特化确保 <code>T</code> 为指针类型时，这些类模板对 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span></span></span> 的特化产出全序，即使对应的内建运算符不如此。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr><td class="mbox-empty-cell"></td><td class="mbox-text" style="">本节未完成<br>原因：暂无示例 </td></tr></table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../utility/functional/equal_to.html" title="cpp/utility/functional/equal to"> <span class="t-lines"><span>equal_to</span></span></a></div></div>
</td>
<td>  实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">==</span> y</span></span> 的函数对象 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../utility/functional/not_equal_to.html" title="cpp/utility/functional/not equal to"> <span class="t-lines"><span>not_equal_to</span></span></a></div></div>
</td>
<td>  实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy3">!</span><span class="sy1">=</span> y</span></span> 的函数对象 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../utility/functional/less.html" title="cpp/utility/functional/less"> <span class="t-lines"><span>less</span></span></a></div></div>
</td>
<td>  实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">&lt;</span> y</span></span> 的函数对象 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../utility/functional/greater.html" title="cpp/utility/functional/greater"> <span class="t-lines"><span>greater</span></span></a></div></div>
</td>
<td>  实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">&gt;</span> y</span></span> 的函数对象 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../utility/functional/less_equal.html" title="cpp/utility/functional/less equal"> <span class="t-lines"><span>less_equal</span></span></a></div></div>
</td>
<td>  实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">&lt;=</span> y</span></span> 的函数对象 <br> <span class="t-mark">(类模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../utility/functional/greater_equal.html" title="cpp/utility/functional/greater equal"> <span class="t-lines"><span>greater_equal</span></span></a></div></div>
</td>
<td>  实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">&gt;=</span> y</span></span> 的函数对象 <br> <span class="t-mark">(类模板)</span> </td></tr>
</table>

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